LIMIT

FunctionA function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - Bounds an integer between low and high limits.

Inputs

IMIN : DINT Low bound
IN : DINT   Inputvalue
IMAX : DINT High bound

Outputs

Q : DINT    IMIN if IN < IMIN; IMAX if IN > IMAX; IN otherwise

Function diagram

Remarks

In FFLD language, the input rung (EN) enables the operation, and the output rung keeps the state of the input rung. In IL"Instruction list" This is a low-level language and resembles assembly language, the first input must be loaded before the function call. Other inputs are operands of the function, separated by a coma.

ST Language

Q := LIMIT (IMIN, IN, IMAX);

FBD Language

FFLD Language

(* The comparison is executed only if EN is TRUE *)
(* ENO has the same value as EN *)

IL Language:

Op1: LD"Ladder diagram" Ladder logic is a method of drawing electrical logic schematics. It is now a very popular graphical language for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the observation that programs in this language resemble ladders, with two vertical "rails" and a series of horizontal "rungs" between them    IMIN
     LIMIT IN, IMAX
     ST    Q

See also

MIN   MAX   MOD   ODD